I found that reducing source images to 25% (or less) of original size seemed 
to produce a good stitch. although I wasn't rendering the full size to 
check, it aligned a screen-size version of the pano perfectly. I wonder if 
cpfind should allow reducing image size by any arbitrary amount (not only 
half, or fullsize)? I mean, half of what? Autopano sift C has a setting that 
allows you to set the size the images are reduced to for analysis.... in 
terms of speed, this is where the tweaking needs to happen, i think.

taking it a step further, could it be possible to first run cpfind first on 
very small versions of the images, and then after some optimization, to run 
cpfind again on only the overlapping portions of the image pairs at a higher 
sensitivity, to align the images more precisely? i could imagine that that 
could increase the speed of cpfind dramatically. would that be possible, or 
is this a bad idea?


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